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Loans - Accruing And Non-Accruing Loans By Class (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income $ 27,990,048 [1] $ 27,535,532 [1] $ 27,249,793
Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 27,744,731 27,312,619  
Total Accruing 27,808,424 27,387,783  
Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 38,577 42,703  
Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 25,116 32,461  
Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 137,663 101,879  
Total Non-Accruing 181,624 147,749  
Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 7,268 11,831  
Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 36,693 34,039  
Commercial | Commercial, financial, and industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 17,176,112 16,514,328 15,828,308
Commercial | Commercial, financial, and industrial | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 17,089,415 16,463,919  
Total Accruing 17,101,116 16,474,552  
Commercial | Commercial, financial, and industrial | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 9,951 8,858  
Commercial | Commercial, financial, and industrial | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,750 1,775  
Commercial | Commercial, financial, and industrial | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 61,711 26,325  
Total Non-Accruing 74,996 39,776  
Commercial | Commercial, financial, and industrial | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 147 5,537  
Commercial | Commercial, financial, and industrial | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 13,138 7,914  
Commercial | Commercial, financial, and industrial | General C&I      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 14,588,545 14,198,499  
Commercial | Commercial, financial, and industrial | General C&I | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 14,508,455 14,153,275  
Total Accruing 14,516,387 14,161,611  
Commercial | Commercial, financial, and industrial | General C&I | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 7,741 8,234  
Commercial | Commercial, financial, and industrial | General C&I | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 191 102  
Commercial | Commercial, financial, and industrial | General C&I | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 61,711 26,325  
Total Non-Accruing 72,158 36,888  
Commercial | Commercial, financial, and industrial | General C&I | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 147 5,537  
Commercial | Commercial, financial, and industrial | General C&I | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 10,300 5,026  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 2,301,340 2,023,746  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 2,301,340 2,023,746  
Total Accruing 2,301,340 2,023,746  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | Loans to Mortgage Companies | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | TRUPs      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 249,402 250,353  
Valuation allowance 20,200 20,200  
Commercial | Commercial, financial, and industrial | TRUPs | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 246,564 247,465  
Total Accruing 246,564 247,465  
Commercial | Commercial, financial, and industrial | TRUPs | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | TRUPs | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | TRUPs | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 2,838 2,888  
Commercial | Commercial, financial, and industrial | TRUPs | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | TRUPs | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,838 2,888  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 36,825 41,730  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 33,056 39,433  
Total Accruing 36,825 41,730  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,210 624  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,559 1,673  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial, financial, and industrial | C&I Purchase Credit Impaired Loans | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial real estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 3,946,943 4,030,870 4,234,435
Commercial | Commercial real estate | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 3,942,875 4,025,398  
Total Accruing 3,944,294 4,027,879  
Commercial | Commercial real estate | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,348 729  
Commercial | Commercial real estate | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 71 1,752  
Commercial | Commercial real estate | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 62  
Total Non-Accruing 2,649 2,991  
Commercial | Commercial real estate | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 51 0  
Commercial | Commercial real estate | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,598 2,929  
Commercial | Commercial real estate | Income CRE      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 3,788,062 3,879,814  
Commercial | Commercial real estate | Income CRE | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 3,785,127 3,876,229  
Total Accruing 3,785,419 3,876,855  
Commercial | Commercial real estate | Income CRE | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 292 626  
Commercial | Commercial real estate | Income CRE | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial real estate | Income CRE | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 30  
Total Non-Accruing 2,643 2,959  
Commercial | Commercial real estate | Income CRE | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 45 0  
Commercial | Commercial real estate | Income CRE | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,598 2,929  
Commercial | Commercial real estate | Residential C R E      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 150,544 135,893  
Commercial | Commercial real estate | Residential C R E | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 150,300 135,861  
Total Accruing 150,538 135,861  
Commercial | Commercial real estate | Residential C R E | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 238 0  
Commercial | Commercial real estate | Residential C R E | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial real estate | Residential C R E | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 32  
Total Non-Accruing 6 32  
Commercial | Commercial real estate | Residential C R E | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 6 0  
Commercial | Commercial real estate | Residential C R E | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 8,337 15,163  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 7,448 13,308  
Total Accruing 8,337 15,163  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 818 103  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 71 1,752  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Commercial | Commercial real estate | CRE Purchase Credit Impaired Loans | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Consumer | Consumer Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 6,151,503 6,249,516 6,355,519
Consumer | Consumer Real Estate | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 6,028,466 6,120,405  
Total Accruing 6,068,907 6,166,868  
Consumer | Consumer Real Estate | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 21,400 24,217  
Consumer | Consumer Real Estate | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 19,041 22,246  
Consumer | Consumer Real Estate | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 63,923 64,155  
Total Non-Accruing 82,596 82,648  
Consumer | Consumer Real Estate | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 6,908 5,238  
Consumer | Consumer Real Estate | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 11,765 13,255  
Consumer | Consumer Real Estate | Home Equity Line of Credit      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 1,458,908 1,526,537  
Consumer | Consumer Real Estate | Home Equity Line of Credit | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 1,380,487 1,443,651  
Total Accruing 1,397,543 1,465,433  
Consumer | Consumer Real Estate | Home Equity Line of Credit | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 9,735 11,653  
Consumer | Consumer Real Estate | Home Equity Line of Credit | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 7,321 10,129  
Consumer | Consumer Real Estate | Home Equity Line of Credit | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 48,772 49,009  
Total Non-Accruing 61,365 61,104  
Consumer | Consumer Real Estate | Home Equity Line of Credit | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 4,223 3,314  
Consumer | Consumer Real Estate | Home Equity Line of Credit | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 8,370 8,781  
Consumer | Consumer Real Estate | R/E installment loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 4,662,749 4,691,169  
Consumer | Consumer Real Estate | R/E installment loans | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 4,623,499 4,652,658  
Total Accruing 4,641,518 4,669,625  
Consumer | Consumer Real Estate | R/E installment loans | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 10,037 10,470  
Consumer | Consumer Real Estate | R/E installment loans | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 7,982 6,497  
Consumer | Consumer Real Estate | R/E installment loans | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 15,151 15,146  
Total Non-Accruing 21,231 21,544  
Consumer | Consumer Real Estate | R/E installment loans | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,685 1,924  
Consumer | Consumer Real Estate | R/E installment loans | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 3,395 4,474  
Consumer | Consumer Real Estate | RE Installment Purchase Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 29,846 31,810  
Consumer | Consumer Real Estate | RE Installment Purchase Credit Impaired Loans | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 24,480 24,096  
Total Accruing 29,846 31,810  
Consumer | Consumer Real Estate | RE Installment Purchase Credit Impaired Loans | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,628 2,094  
Consumer | Consumer Real Estate | RE Installment Purchase Credit Impaired Loans | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 3,738 5,620  
Consumer | Consumer Real Estate | RE Installment Purchase Credit Impaired Loans | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Consumer | Consumer Real Estate | RE Installment Purchase Credit Impaired Loans | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Consumer | Consumer Real Estate | RE Installment Purchase Credit Impaired Loans | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Consumer | Permanent Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 209,260 222,448 270,721
Consumer | Permanent Mortgage | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 184,237 193,591  
Total Accruing 188,310 200,738  
Consumer | Permanent Mortgage | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,494 2,585  
Consumer | Permanent Mortgage | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 2,579 4,562  
Consumer | Permanent Mortgage | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 11,874 11,227  
Total Non-Accruing 20,950 21,710  
Consumer | Permanent Mortgage | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 95 996  
Consumer | Permanent Mortgage | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 8,981 9,487  
Consumer | Credit Card and Other      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 506,230 518,370 $ 560,810
Consumer | Credit Card and Other | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 499,738 509,306  
Total Accruing 505,797 517,746  
Consumer | Credit Card and Other | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 4,384 6,314  
Consumer | Credit Card and Other | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 1,675 2,126  
Consumer | Credit Card and Other | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 155 110  
Total Non-Accruing 433 624  
Consumer | Credit Card and Other | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 67 60  
Consumer | Credit Card and Other | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 211 454  
Consumer | Credit Card and Other | Credit Card      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 195,715 191,345  
Consumer | Credit Card and Other | Credit Card | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 193,754 188,009  
Total Accruing 195,715 191,345  
Consumer | Credit Card and Other | Credit Card | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 992 2,133  
Consumer | Credit Card and Other | Credit Card | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 969 1,203  
Consumer | Credit Card and Other | Credit Card | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Consumer | Credit Card and Other | Credit Card | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Consumer | Credit Card and Other | Credit Card | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Consumer | Credit Card and Other | Other Consumer Loans Class      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 309,240 325,271  
Consumer | Credit Card and Other | Other Consumer Loans Class | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 305,267 320,551  
Total Accruing 308,807 324,647  
Consumer | Credit Card and Other | Other Consumer Loans Class | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 3,067 3,570  
Consumer | Credit Card and Other | Other Consumer Loans Class | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 473 526  
Consumer | Credit Card and Other | Other Consumer Loans Class | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 155 110  
Total Non-Accruing 433 624  
Consumer | Credit Card and Other | Other Consumer Loans Class | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 67 60  
Consumer | Credit Card and Other | Other Consumer Loans Class | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 211 454  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total loans, net of unearned income 1,275 1,754  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 717 746  
Total Accruing 1,275 1,754  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 325 611  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 233 397  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Non-Accruing      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Current 0 0  
Total Non-Accruing 0 0  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Non-Accruing | 30-89 Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due 0 0  
Consumer | Credit Card and Other | Other Purchased Credit Impaired Loans | Non-Accruing | 90+ Days Past Due      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Past due $ 0 $ 0  
[1] March 31, 2019 and December 31, 2018 include $24.1 million and $28.6 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.